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  1. #1
    Join Date
    Sep 2012
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    One zone only runs when other zone running?

    I received such great advice on my first problem I decided to ask about my second.

    I have a 4600 sf house running off two a/c's and furnaces - one for upstairs and one for downstairs.

    The upstairs has two zones (at least I think that is what it means when you have two thermostats?) and presumably a damper in the attic (again?).

    In my experience, the a/c (and perhaps heat but certainly a/c) only runs for the play-room over the garage zone when the main zone (master bedroom) is triggered and running.

    I hope I have defined the issue accurately. How would a tech investigate a problem like this - do they have to go up to the attic?

    Thanks for advice or questions!!

    Rick

  2. #2
    Join Date
    Jan 2004
    Location
    PA
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    May be wired/set up as a slave zone that can only work when the other zone is calling.

    A 2 zoned system would have at least 2 dampers. 1 for each zone.
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  3. #3
    Join Date
    Sep 2012
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    Thread Starter
    Thanks been there, would be some reason to do that? I'm not sure why that would be good.

    Is it possible it is just a damper problem? (I'm totally shooting in the dark.)

  4. #4
    Join Date
    Jan 2004
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    PA
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    Done sometimes to make sure a zone that is too small doesn't harm the furnace.

    Not a damper problem, since it does work. more of a setup problem, wiring problem, or as said earlier, its set to be a slave zone.
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  5. #5
    Join Date
    Sep 2012
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    Thread Starter
    Ah! The too small thought makes sense. It is a pretty big room and bathroom but doesn't have its own return. A contractor offered to add a return but its not really a comfort problem - was just pointed out by home inspector and been bugging me since. Thank you!

  6. #6
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
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    I'm curious if it even has a zone control.
    The thermostat for the bonus room may only open and close a damper for the duct(s) to the room.

    Screwy way to do it, but it sometimes gets done that way because it is cheap.

  7. #7
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
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